JP4285143B2 - Vehicle switch - Google Patents

Description

  The present invention relates to a vehicular switch that is mounted mainly on an automobile and detects opening and closing of a door.

  In recent years, a vehicle switch has been mounted on the main body side of a door part of an automobile, thereby detecting the opening / closing of the door, and controlling the lighting / extinguishing of lighting in the vehicle interior, door locking, etc. according to the detected signal. Widely done.

  In addition to these functions, door opening / closing detection signals can be used to control sophisticated systems such as a smart entry system that is more anti-theft and more convenient.

  Such a conventional vehicle switch will be described with reference to FIGS.

  FIG. 5 is a cross-sectional view of a conventional vehicle switch, and FIG. 6 is an exploded perspective view thereof. In FIG. 5, 1 is a case made of a substantially box-shaped insulating resin with a top opening, and 2 is a substantially cylindrical operation at the top. An operating body provided with a portion 2A is housed in the case 1 so as to be movable up and down.

  Reference numeral 3 denotes a flat substrate having a plurality of wiring patterns (not shown) made of insulating resin on both sides, on which various electronic components such as resistance elements are mounted, and on the right side, the operation body 2 Fixed contact points 4A and 4B made of conductive metal are arranged so as to face each other substantially parallel to the moving direction.

  A plurality of terminals 5 connected to the fixed contacts 4A and 4B via wiring patterns or the like are fixed to the lower side of the substrate 3, and the lower end of the substrate 3 is held by the holding body 6 and is placed in the case 1. Storage is fixed.

  Reference numeral 7 denotes a movable contact piece made of a thin metal plate having a substantially U shape. The upper surface and one end are held by the lower surface of the operating body 2 and the contact portions 7A and 7B formed to extend downward from the other end are fixed. Each of the contacts 4A and 4B is elastically contacted.

  Further, 8 is a coil spring, which is mounted in a slightly bent state between the inner bottom surface of the case 1 and the lower surface of the operating body 2 and biases the operating body 2 upward.

  Reference numeral 9 is a steel plate mounting plate, 10 is a waterproof cover formed of rubber, thermoplastic elastomer, or the like. The case 1 is locked to the left side of the mounting plate 9 and the mounting hole on the right side of the mounting plate 9. 9A is provided, and the waterproof cover 10 covers the operation part 2A of the operation body 2 and the upper surface of the mounting plate 9, and the switch for vehicles is comprised.

  In the vehicular switch configured as described above, the terminal 5 projecting outward from the lower side of the case 1 is connected to an electronic circuit (not shown) of the automobile, and the mounting plate 9 is attached by a screw (not shown) or the like. The mounting hole 9A is attached to a chassis (not shown) on the vehicle body side facing the end of the door (not shown).

  Then, as shown in the sectional view of FIG. 5, the contact portions 7A and 7B are in elastic contact with each other, and the fixed contact 4A and 4B are energized with a voltage current of, for example, DC12V1mA to 10mA through the movable contact piece 7. When the door is closed, the operation portion 2A covered with the waterproof cover 10 is pressed by the door end, and the operation body 2 moves downward while bending the coil spring 8.

  Accordingly, the contact portions 7A and 7B of the movable contact piece 7 held by the operating body 2 move downward while sliding elastically on the fixed contacts 4A and 4B, and the contact portion 7B is separated from the fixed contact 4B and fixed. The contact 4A, 4B is turned off.

  Then, an OFF signal between the fixed contacts 4A and 4B is output to the electronic circuit of the automobile, for example, the interior lamp is turned off, and the automatic door lock device, the anti-theft device and the like perform a predetermined operation.

  Further, when the door is opened, the door end is separated from the operation portion 2A, the operation body 2 biased by the coil spring 8 moves upward, and the movable contact piece 7 also moves upward. The original ON state shown in FIG. 5 is restored, and this ON signal is output to the electronic circuit. For example, the indoor lamp is turned on, and at the same time, the related device performs a predetermined operation. .

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2003-132761 A

  However, in the conventional vehicle switch described above, the contact portion between the fixed contacts 4A and 4B on the substrate 4 is repeated by repeating the electrical contact and separation of the fixed contacts 4A and 4B by the elastic contact sliding of the movable contact piece 7. 7A and 7B and fixed contact points 4A and 4B are easily deposited with metal wear powder and the distance between the fixed contact points 4A and 4B is narrow and flat, so that water enters the case 1 and the substrate 4 is exposed to water. In such a case, there is a problem that the insulation between the fixed contacts 4A and 4B tends to be lowered.

  SUMMARY OF THE INVENTION The present invention solves such a conventional problem, and an object of the present invention is to provide a vehicular switch that has a simple configuration, has little insulation deterioration between fixed contacts, and is stable in electrical contact and separation.

  In order to achieve the above object, the present invention has the following configuration.

According to the first aspect of the present invention, there is provided a substantially box-shaped case made of an insulating resin, an operating body movably accommodated in the case, and a plurality of fixed contacts arranged in the case. A flat plate-like substrate provided, one end of which is substantially U-shaped and held by the operating body, and a plurality of contact portions are extended to the other end, and the fixed contact with the movement of the operating body. The movable contact piece that performs electrical contact and separation, the plurality of fixed contacts are opposed substantially parallel to the moving direction of the movable contact piece, and one fixed contact that is electrically connected to the ground side is elongated, The other fixed contact that is electrically connected to the power supply side is formed short, and a slit extending from both ends of the shorter fixed contact is provided between these fixed contacts to move the operating body. Accordingly, one contact portion of the movable contact piece is elastically slid on the long fixed contact. Metal together, which has constituted the vehicle switch is formed as the other contact portion is elastic contact or away from said short fixed contact, it is possible to secure a large creeping distance between the fixed contacts by the slit, between the fixed contacts to or abrasion powder or the like is deposited, also the substrate between the fixed contacts and the water less reduced insulation between the fixed contacts, have a effect that it is possible to obtain a stable vehicle switch of electrical connection and disconnection, In addition, by providing a slit that extends beyond both ends of the shorter fixed contact, the creepage distance can be secured with a short slit, so that the strength of the substrate is not reduced and insulation deterioration between the fixed contacts is prevented. Has the effect of being able to.

  As described above, according to the present invention, it is possible to obtain an advantageous effect that it is possible to realize a vehicular switch in which the insulation between fixed contacts is small and the electrical contact and separation are stable.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of background art, and detailed description is simplified.

(Embodiment)
FIG. 1 is a sectional view of a vehicle switch according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, in which 1 is a case made of an insulating resin having a substantially box shape with an upper surface opening, and 2 is an upper portion. The operation body 2 is provided in the case 1 so as to be movable up and down.

  Reference numeral 11 denotes a flat substrate having a plurality of wiring patterns (not shown) made of insulating resin on both sides, on which various electronic components such as resistance elements are mounted. Conductive metal fixed contacts 12A and 12B are arranged to face each other substantially parallel to the moving direction.

  The fixed contacts 12A and 12B are formed such that the fixed contact 12A is long and the fixed contact 12B is short with respect to the moving direction of the operating body 2, and the fixed contact 12B is substantially intermediate between the fixed contacts 12A and 12B. A slit 14 extending from both end positions of the upper end and the lower end is provided.

  Further, a plurality of terminals 13 connected to the fixed contacts 12A and 12B via a wiring pattern or the like are fixed to the lower side of the substrate 11, and the lower end of the substrate 11 is held by the holding body 6 and placed in the case 1. Storage is fixed.

  Reference numeral 7 denotes a movable contact piece made of a thin metal plate having a substantially U shape. The upper surface and one end of the movable contact piece are held on the lower surface of the operation body 2 and the other end includes contact portions 7A and 7B formed extending downward. The fixed contacts 12A and 12B are in elastic contact with each other.

  A coil spring 8 is mounted between the inner bottom surface of the case 1 and the lower surface of the operating body 2 in a slightly bent state, and biases the operating body 2 upward.

  Reference numeral 9 is a steel plate mounting plate, 10 is a waterproof cover formed of rubber, thermoplastic elastomer or the like. The case 1 is locked to the left side of the mounting plate 9 and the mounting hole is on the right side of the mounting plate 9. 9A is provided, and the waterproof cover 10 covers the operation part 2A of the operation body 2 and the upper surface of the mounting plate 9, and the switch for vehicles is comprised.

  In the vehicular switch configured as described above, the terminal 13 protruding outside the case 1 is connected to an electronic circuit (not shown) of an automobile via a connector or a lead wire (not shown). The mounting hole 9A of the mounting plate 9 is attached to the chassis (not shown) on the vehicle body side facing the end of the door (not shown) by screws (not shown) or the like.

  At this time, the short fixed contact 12B is electrically connected to the power source side of the electronic circuit of the automobile, and the long fixed contact 12A is electrically connected to the ground side of the electronic circuit.

  Then, when the contact portions 7A and 7B are in elastic contact with each other and the door is closed from an ON state in which a voltage current of, for example, DC12V1mA to 10mA is applied to the fixed contacts 12A and 12B via the movable contact piece 7, FIG. 3, the operation portion 2 </ b> A covered by the waterproof cover 10 is pressed by the door end, and the operation body 2 moves downward while bending the coil spring 8.

  As a result, as shown in the perspective view of the main part in FIG. 4A, the movable contact piece 7 held by the operating body 2 moves downward, and the contact portions 7A and 7B that are elastically contacted with the fixed contacts 12A and 12B 4 (b), the contact portion 7A is elastically slid on the fixed contact 12A, and the contact portion 7B is elastically slid on the substrate 11 away from the fixed contact 12B. Between 12B is OFF.

  Then, an OFF signal between the fixed contacts 12A and 12B is output to the electronic circuit of the automobile, for example, the interior lamp is turned off, and the automatic door lock device, the anti-theft device and the like perform a predetermined operation.

  Further, when the door is opened, the door end is separated from the operation portion 2A, the operation body 2 biased by the coil spring 8 moves upward, and the movable contact piece 7 also moves upward. The original ON state shown in 1 is restored, and this ON signal is output to the electronic circuit. For example, the indoor lamp is turned on, and at the same time, the predetermined operation of the related device is performed.

  As the door is opened and closed, the operating body 2 moves up and down, the movable contact piece 7 is elastically contacted and separated from the fixed contacts 12A and 12B, and the electrical contact and separation are repeated. Metal sliding wear powder of the fixed contacts 12A and 12B is generated on the substrate 11 between the fixed contacts 12A and 12B, but since this substantially middle is separated by the gap of the slit 14, the fixed contacts 12A and 12B. The creepage distance between them is configured to be large.

  As described above, according to the present embodiment, by providing the slit 14 between the fixed contacts 12A and 12B of the substrate 11, even if metal wear powder or the like is generated between them, there is little decrease in insulation between the fixed contacts, and electrical A vehicle switch with stable contact and separation can be obtained.

  Furthermore, even if water or the like enters the case 1 and the substrate 11 is wetted, the fixed contacts 12A and 12B are separated by the gap of the slit 14, so that the insulation is reduced due to moisture absorption and the DC voltage is increased. It is possible to make it difficult for so-called migration or the like that the metal of one fixed contact is ionized and deposited on the other fixed contact.

  In addition, since the fixed contact 12B is formed shorter than the fixed contact 12A and the slit 14 is provided so as to extend beyond both ends of the fixed contact 12B, the creeping distance can be secured by the short slit 14, and thus the strength of the substrate 11 is reduced. Can also be reduced.

  The vehicular switch according to the present invention has a simple configuration and little insulation deterioration between fixed contacts, can be made stable in electrical contact and separation, and is useful for detection of opening and closing of an automobile door.

Sectional drawing of the switch for vehicles by one embodiment of this invention Exploded perspective view Cross section during the same operation Perspective view of the main part Sectional view of a conventional vehicle switch Exploded perspective view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Operation body 2A Operation part 6 Holding body 7 Movable contact piece 7A, 7B Contact part 8 Coil spring 9 Mounting plate 9A Mounting hole 10 Waterproof cover 11 Board | substrate 12A, 12B Fixed contact 13 Terminal 14 Slit

Claims (1)

A substantially box-shaped case made of an insulating resin, an operation body movably accommodated in the case, a flat board having a plurality of fixed contacts disposed and fixed in the case ; One end is held by the operating body in the shape, and a plurality of contact portions are formed to extend to the other end, and a movable contact piece that performs electrical contact with and separation from the fixed contact as the operating body moves, The plurality of fixed contacts are opposed substantially parallel to the moving direction of the movable contact piece, and one of the fixed contacts that are electrically connected to the ground side is long and the other of the other that is electrically connected to the power source side. A fixed contact is formed short, and a slit extending from both ends of the shorter fixed contact is provided between the fixed contacts. While sliding on a long fixed contact, the other contact is short. Constant contact and elastic contact or forming the switch for a vehicle away.

Images